Synchronized code after a service call

Hi,

I am new in using GWT.

I make a call to a remote service from within a for loop and update a FlexTable in a DialogBox.
After finishing the loop, I would like to add extra row to the table with two button.
Here is how the code structure looks like:

initDialogBox(); // instantiate a dialogbox and set the caption and add a FlexTable  

for (final String str : strList) {
   configurationsService.testStr(str,
        new AsyncCallback<Boolean>() {
        @Override
        public void onSuccess(Boolean result) {
             updateDialogBox(db, result);  // get the FlextTable and add a row to it with db and result as columns
        }

       @Override
        public void onFailure(Throwable caught) {
              // some code           
        }
    });
}
finalizeDialogBox(); // add two button to the last row of the table


The problem is it seems finalizeDialogBox() runs before service call finishes and table
appears with two buttons at the first row.

Any idea how to fix this?

Thanks,
Cheers,
Alireza

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